Active solid-state devices (e.g. – transistors – solid-state diode – Voltage variable capacitance device – With specified housing or contact
Reexamination Certificate
2004-08-16
2008-03-18
Dickey, Thomas L. (Department: 2826)
Active solid-state devices (e.g., transistors, solid-state diode
Voltage variable capacitance device
With specified housing or contact
C257S595000
Reexamination Certificate
active
07345354
ABSTRACT:
The present invention provides an varactor, a method of manufacture thereof. In an exemplary embodiment, the varactor includes a semiconductor substrate and well of a first and second conductivity type, respectively. A conductive region in the well has a same conductivity type as the well but a lower resistivity than the well. At least a portion of the well is between at least two sides of the conductive region and an area delineated by an outer perimeter of a conductive layer over the well. Such varactors have a lower series resistance and therefore have an increased quality factor.
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Parent case U.S. Appl. No. 10/454,133, filed on Jun. 4, 2003 entitled “Increased Quality Factor of a Varactor in an Integrated Circuit Via a High Conductive Region in a Well” to Shye Shapira et al.; allowed on May 24, 2004.
Johnson Debra
Moinian Shahriar
Shapira Shye
Agere Systems Inc.
Dickey Thomas L.
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